Got a C7 lt1 with lt4 fuel system and blower, port injection, cam, and heads. Car has been tuned on Lt4 stuff on e50 for the last 1.5 years no issues. This round we did ported blower and snout, port injection, heads, cam and e85. Everything was going ok on the dyno. Then unstrapped it to do some road tests, and come back in and go to restart the car and goes Rep mode with p16f3 code. I couldnt read it with Hptuners, so I read it with the Autel. But it would reoccur after clearing codes, key on engine off. So I used Hptuners to write the ecm and tcm to clear the code. Then after the second roadtest, came back to the shop, shut the car off, went to restart it, p16f3 again, and this time it will not clear after writing the ecm/tcm. Car is immobile, as soon as the starter turns over the check engine light emits and Rep mode. Has anyone experienced this and have any reason for p16f3 and remedy?